#include "com_serialassistant_SerialPort.h"
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>

#include <android/log.h>
static const char *TAG="serial_port";
#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO,  TAG, fmt, ##args)
#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)

#define COMNAME "/dev/ttymxc2"
static int fd=-1;
static speed_t getBaudrate(jint baudrate)
{
	switch(baudrate) {
	case 0: return B0;
	case 50: return B50;
	case 75: return B75;
	case 110: return B110;
	case 134: return B134;
	case 150: return B150;
	case 200: return B200;
	case 300: return B300;
	case 600: return B600;
	case 1200: return B1200;
	case 1800: return B1800;
	case 2400: return B2400;
	case 4800: return B4800;
	case 9600: return B9600;
	case 19200: return B19200;
	case 38400: return B38400;
	case 57600: return B57600;
	case 115200: return B115200;
	case 230400: return B230400;
	case 460800: return B460800;
	case 500000: return B500000;
	case 576000: return B576000;
	case 921600: return B921600;
	case 1000000: return B1000000;
	case 1152000: return B1152000;
	case 1500000: return B1500000;
	case 2000000: return B2000000;
	case 2500000: return B2500000;
	case 3000000: return B3000000;
	case 3500000: return B3500000;
	case 4000000: return B4000000;
	default: return -1;
	}
}
/*
 * Class:     com_serialassistant_SerialPort
 * Method:    open
 * Signature: (I)Ljava/io/FileDescriptor;
 */
JNIEXPORT jobject JNICALL Java_com_serialassistant_SerialPort_open
  (JNIEnv *env, jclass thiz, jint baudrate){
	
	  //int fd;
	  speed_t speed;
	  jobject mFileDescriptor;

	  //check arguments
		speed = getBaudrate(baudrate);
		if(speed == -1){
			LOGE("Invalid baudrate");
			return NULL;
		}

	//opening device
		fd = open(COMNAME, O_RDWR | O_SYNC);
		LOGD("open() fd=%d", fd);

		if(fd == -1){
			LOGE("Cannot open port");
			return NULL;
		}
		
	//Configure device
		struct termios cfg;
		if(tcgetattr(fd, &cfg)){
			LOGE("tcgetattr() failed");

			close(fd);
			return NULL;
		}
	
		cfmakeraw(&cfg);
		cfsetispeed(&cfg, speed);
		cfsetospeed(&cfg, speed);

		if(tcsetattr(fd, TCSANOW, &cfg)){
			LOGE("tcsetattr() failed");
			close(fd);
			return NULL;
		}

		jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
		jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
		jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
		mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
		(*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);

		return mFileDescriptor;

  }
/*
 *  * Class:     com_serialassistant_SerialPort
 *   * Method:    close
 *    * Signature: ()V
 *     */
JNIEXPORT void JNICALL Java_com_serialassistant_SerialPort_close
  (JNIEnv *env, jclass thiz){

  
	//jclass SerialPortClass = (*env)->GetObjectClass(env, thiz);
	//jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor");
	
	//jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;");
	//jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I");

	//jobject mFd = (*env)->GetObjectField(env, thiz, mFdID);
	//jint descriptor = (*env)->GetIntField(env, mFd, descriptorID);

	LOGD("close(fd = %d)", fd);
	close(fd);
	//close(descriptor);
	
  }

